1556219340678 has 24 divisors (see below), whose sum is σ = 3128649313608. Its totient is φ = 516051935232.

The previous prime is 1556219340667. The next prime is 1556219340701. The reversal of 1556219340678 is 8760439126551.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3258075 + ... + 3705062.

It is an arithmetic number, because the mean of its divisors is an integer number (130360388067).

It is a 1-persistent number, because it is pandigital, but 2⋅1556219340678 = 3112438681356 is not.

Almost surely, 2^{1556219340678} is an apocalyptic number.

1556219340678 is an abundant number, since it is smaller than the sum of its proper divisors (1572429972930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1556219340678 is an equidigital number, since it uses as much as digits as its factorization.

1556219340678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6963528 (or 6963335 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 57.

The spelling of 1556219340678 in words is "one trillion, five hundred fifty-six billion, two hundred nineteen million, three hundred forty thousand, six hundred seventy-eight".